What is the name of this event held from 30 August to 6 September 1981, in which Reima Karppinen won a silver medal?
1981 World Rowing Championships
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Section::::Abstract.
Reima Karppinen
41656596
-1
Section::::Abstract.
Reima Karppinen
41656596
-1
Section::::Abstract.
1981 World Rowing Championships
31884905